Mass, in music, the setting, either polyphonic or in plainchant, of the liturgy of the Eucharist. The term most commonly refers to the mass of the Roman Catholic church, whose Western traditions used texts in Latin from about the 4th century to 1966, when the use of the vernacular was mandated. The Anglican mass, commonly called communion service, contains the same elements but has usually been sung in the English translation from the Book of Common Prayer. The Lutheran mass consists of the first two elements of the Roman mass, the Kyrie and the Gloria. In modern times other Protestant churches have borrowed freely from musical masses for their own liturgical uses and for special music. (For the Eastern traditions seeByzantine chant; Armenian chant; Ethiopian chant; Coptic chant; Syrian chant.)

The Ordinary. The Ordinary of the mass employs texts that remain the same for every mass. Those sung by the choir are, in the Latin mass, the Kyrie, Gloria, Credo, Sanctus (sometimes divided into Sanctus and Benedictus), and Agnus Dei, although the intonations of Gloria and Credo are sung by the celebrant.

The earliest musical settings of the mass were plainchant (one voice part, in free rhythm) melodies. From the 9th to the 16th centuries some plainchants were expanded by means of tropes; i.e., the grafting of new music and new texts onto the original chants.

Organum, the simultaneous combination of more than one melody, was developed in about the 9th century. The Winchester Troper, a manuscript from about the 11th century, contains 12 Kyries and 8 Glorias in two-part organum; the notation, however, cannot be deciphered. In the 12th and 13th centuries further developments of organum took place in the Magnum Liber Organi.

In about 1300, polyphonic cycles of the Ordinary (having two or more sections musically related to one another) appeared. The French composer Guillaume de Machaut (d. 1377) wrote the first complete Ordinary cycle, the Messe de Notre Dame.

The secular music style of the 14th century manifested itself in Ordinary settings, which at that time were rarely based on plainsong melodies. The music is basically in descant or treble-dominated style: a melodically and rhythmically elaborated upper part over two slower moving parts, usually for instruments.

In the 15th and 16th centuries numerous composers chose the Ordinary as a chief means of musical expression. Masters of the 15th century were the Englishman John Dunstable and the Burgundian Guillaume Dufay. Both applied the treble-dominated style of plainsong. Dufay brought to completion the developments of cantus firmus mass, in which each section of the Ordinary is based on a precomposed melody, or cantus firmus, usually either a plainchant melody or a secular song. The celebrated Flemish composer Josquin des Prez (d. 1521), among his several other innovations, perfected the parody mass: the borrowing and free elaboration of two or more parts of another sacred or secular composition within a new setting of the Ordinary texts. He also standardized the use of melodic imitation by having each voice begin in turn with the same motif.

The works of the Italian composer Giovanni da Palestrina (d. 1594) summarize the techniques of his era. His style was later termed the stile antico, the ancient polyphonic style, in contrast to the stile moderno, the 17th-century modern solo style. In the 17th century these two styles are found, sometimes even juxtaposed, in the Ordinary of the mass settings, along with the use of the concertato principle: one or more solo voices or instruments, in running scale passages, that contrast with the whole choral and instrumental ensemble. In such settings the text is separated into smaller units to permit varied settings and instrumental interludes.

In the 18th century, the Neapolitan Alessandro Scarlatti continued the operatic approach, as did Haydn and Mozart. Beethoven’s Missa Solemnis (completed 1823) flows from the contemplation of the liturgy, as does J.S. Bach’s Mass in B Minor (1724–46), but neither was meant to accompany it.

The Proper. The Proper of the mass includes the scriptural texts that change daily with the liturgical calendar. The Proper texts sung by the choir, with the participation of soloists, are the Introit, Gradual, Alleluia or Tract, Sequence, Offertory, and Communion.

As with the Ordinary, the earliest settings are in plainchant, and troping also existed in the Propers. The Winchester Troper includes 3 Introits, 53 Alleluias, 19 Tracts, and 7 Sequences in undecipherable note-against-note organum. Around 1200, two of the composers of Notre-Dame Cathedral, Paris, Léonin and Pérotin, wrote the Magnus Liber Organi, a compilation including settings of 59 Graduals and Alleluias in two to four voices. Some pieces have an unmeasured melismatic (many notes per syllable) upper voice over prolonged notes of the chant; others have measured, regular, recurring rhythmic patterns in all of the voices.

Around 1430 Dufay reawakened interest in settings of the Proper. Much later, collections of polyphonic Proper settings for the liturgical year are found in the German Heinrich Isaac’sChoralis Constantinus (begun 1550, completed 1555 by Ludwig Senfl) and in the German Georg Rhau’s publications for the Lutheran Church in 1539 and 1545.

Within the Roman Catholic Church, the liturgical reforms of the Council of Trent (1545–63) gave new impetus to Proper settings. Starting with Giovanni Contino in 1560, numerous Italian composers wrote settings of the Proper. In 1605 and 1607 appeared the two books of the English composer William Byrd’sGradualia, a collection of polyphonic Propers for major feasts.

Systematic development of the Propers in music was rare from the Baroque era on.

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